Trade annulment

Once an order matches on the exchange, it becomes a trade — and ordinarily a trade is final. But orders can be entered wrong: a fat-finger price, a misplaced decimal, a quantity typed in the wrong field. Trade annulment is the narrow, time-boxed route to undo a trade that should never have happened, rather than leaving both sides to live with someone's mistake.

The workbook's own words: "Trading members are allowed to submit a request for trade annulment on the trading system. The request should be submitted within 30 minutes from the point of trade execution. A trade annulment request should satisfy certain conditions for further processing."

Trade annulment sits alongside order modification/cancellation and trade modification as ways the trading system lets a trading member correct a mistake, but it is the most restrictive of the three because it undoes a trade that has already executed:

• Order modification/cancellation — orders can be modified on price or quantity, or cancelled, only while not fully executed; an order loses time priority in certain modification scenarios.
• Trade modification — after execution, only limited parameters (client code and custodian participant code) can be modified, subject to conditions, timings and possible penalties.
• Trade annulment — the most drastic step, cancelling the trade itself, is available only:
  • on request by the trading member, submitted on the trading system;
  • within 30 minutes from the point of trade execution — a hard time window, not a guideline;
  • where the request satisfies certain conditions for it to be processed further (the workbook does not itemise every condition, only that conditions must be met);
  • on payment of an annulment application fee, based on the value of the trade(s) for which annulment is requested, subject to a minimum and a maximum fee.

Because the fee is charged for accepting the request and is itself value-based with a floor and a ceiling, annulment is deliberately made costly enough that it is not used as a routine way to walk back an unfavourable trade — only genuine execution errors that meet the exchange's conditions.

A dealer at a trading member enters a sell order for a currency futures contract intending to key in 83.50 but instead enters 8.350 — a decimal-point slip that executes instantly against a resting buy order, because the price is wildly away from the market.

Had the trading member noticed the error only at 11:10 am — 56 minutes after execution — the request would fall outside the 30-minute window and could not be submitted for annulment at all, whatever the size of the error. The trade would stand, and the loss would have to be resolved between the parties by other means, not through the trading system's annulment facility.

Chapter 6 (Trading Mechanism in Exchange Traded Currency Derivatives), section 6.3.4 (Trade execution), introduces trade annulment immediately after trade modification, in the same short passage that distinguishes what can be changed before execution (orders) from what can be changed after (trades). Expect a direct recall question on the 30-minute window, and a question distinguishing order cancellation, trade modification and trade annulment by what each one is allowed to change.

• 30 minutes runs from the point of trade execution, not from order placement and not from when the error is discovered.
• Trade annulment cancels an executed trade; order cancellation only works before execution. Once a trade has happened, cancelling the order is no longer possible — annulment is the only route back, and only within the window.
• A fee applies even when the request is accepted — annulment is not free, and it is value-based with a floor and a ceiling, not a flat amount.
• The request must satisfy conditions to be processed — submitting within 30 minutes is necessary but the workbook does not say it is sufficient on its own.
• Trade modification (client code, custodian participant code) is a different, narrower facility from trade annulment — modification changes details of a trade that stands; annulment undoes the trade entirely.